Functionalizing the interfacial double layer to enable uniform zinc deposition  

作　　者：Yihu Li Hao Wang Tingqing Wu Chunlin Xie Zefang Yang Qi Zhang Dan Sun Yougen Tang Liang Fu Haiyan Wang 

机构地区：[1]Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China

出　　处：《Science China Chemistry》2023年第6期1844-1853,共10页中国科学（化学英文版）

基　　金：financially supported by National Natural Science Foundation of China(22272205,21975289 and U19A2019);Hunan Province Natural Science Foundation(2020JJ5694);Hunan Provincial Science and Technology Plan Project of China(2017TP1001,2018RS3009 and 2020JJ2042);the Fundamental Research Funds for Central Universities。

摘　　要：Due to the unsatisfactory electrode/electrolyte interface,the metallic Zn dendrites and corrosion are easily induced,severely hindering the applications of zinc-ion batteries(ZIBs).Herein,a strategy that engineers the interfacial double layer by an extremely low concentration of sulfolane is proposed to tune the Zn stripping/plating behavior.It is revealed that the highly-polar sulfolane can predominately occupy the inner Helmholtz layer over water,and then regulate the upcoming Zn2+to directly deposit downward.Simultaneously,the widened Helmholtz layer can weaken the electric field intensity,which will generate more nucleation sites and reduce the nuclei radius,thereby promoting uniform zinc deposition as well.Moreover,corrosion byproducts can be inhibited since fewer water molecules can contact the Zn electrodes.Consequently,the battery performance can be naturally optimized.With an optimum amount of sulfolane,the Zn||Zn battery can operate for more than 1,100 h under1 m A cm^(-2)and 1 m Ah cm^(-2).And the as-constructed Zn||NaV_(3)O_(8)·1.5H_(2)O battery demonstrates considerably higher cycling stability than that without sulfolane.Overall,this work has provided a deep insight into constructing a functional interfacial double layer to regulate zinc deposition,which can also act as a reference for other metal-based batteries.

关 键 词：zinc dendrites interface Helmholtz layer SULFOLANE preoccupation 

分 类 号：TM912[电气工程—电力电子与电力传动]